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# Chapter 9

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### Chapter 9

1. 1. Speeding Up, Slowing down <ul><li>What happens to objects when they move? </li></ul>
2. 2. Acceleration <ul><li>Define to the person next to you, the terms: </li></ul><ul><ul><li>Velocity </li></ul></ul><ul><ul><li>Displacement </li></ul></ul><ul><ul><li>Acceleration </li></ul></ul>
3. 3. Acceleration <ul><li>Acceleration is </li></ul><ul><li>Change in Velocity / Time Taken </li></ul><ul><li>Some definitions: </li></ul><ul><li>S = displacement </li></ul><ul><li>U = initial velocity </li></ul><ul><li>V = final velocity </li></ul><ul><li>A = acceleration </li></ul><ul><li>T = time taken </li></ul>Therefore acceleration is written: a = (v – u) / t Can we sketch a graph of this?
4. 4. In this example a = (20 – 0) / 11 = 1.8 ms -2 followed by zero acceleration (constant velocity)
5. 5. v = u + at This is the first equation of motion where acceleration is uniform…
6. 6. Example <ul><li>What is the final velocity of a car that accelerates from a velocity of 25ms -1 at an acceleration of 4ms -2 for 20 seconds? What would it be if it started from rest at the same acceleration and time? </li></ul><ul><li>Answer: </li></ul><ul><li>v = u + at = 25 + 4 x 20 = 105 ms -1 </li></ul><ul><li>From rest v = at = 80 ms -1 </li></ul>
7. 7. How far would something travel..? <ul><li>Using the SUVAT terms, can you express displacement? </li></ul><ul><li>Think about Speed = ..? </li></ul>
8. 8. These are the other 3 equations that you need to know how to use…
9. 9. Exercises <ul><li>Answer Question on sheet </li></ul><ul><li>Questions 1, 2, 4 and 6 </li></ul>
10. 10. Vertical and Horizontal Motion http://www.rmutphysics.com/charud/virtualexperiment/virtual2/monkey-hunter/index.html
11. 11. Components of Motion <ul><li>Horizontal and Vertical components are treated separately </li></ul><ul><li>Acceleration is generally considered to be: </li></ul><ul><ul><li>Zero horizontally </li></ul></ul><ul><ul><li>g vertically ( = 9.8 ms -2 on Earth) </li></ul></ul><ul><li>The SUVAT equations are applied separately </li></ul>
12. 12. Components of Motion